Thinning as a failure criterion during sheet metal forming

Sarkar, B.; Jha, B. K.; Mukerjee, D.; Jha, Sujit Kumar; Narasimhan, K.

doi:10.1007/bf02715421

Cited by 6 publications

(3 citation statements)

References 3 publications

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“…However, for the hot stamping process, which is the subject of this study, it is very difficult to obtain reliable sheet forming limit curve data for numerous materials and process conditions including various temperatures and strain-rates [25]. On the other hand, as a criterion for simple and convenient prediction of sheet fracture in press forming, the thickness strain of the sheet blank can be used instead of the FLC [26,27]. Therefore, in this study, thickness strain was used for convenience as a criterion for predicting the forming limit, which is one of the formability criteria.…”

Section: Effect Of Process and Materials Variables On Hot Stamping Fo...mentioning

confidence: 99%

A Study on the Effect of Process and Material Variables on the Hot Stamping Formability of Automotive Body Parts

You

Kim

2021

Metals

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Hot stamping is a method capable of manufacturing high-strength automotive body parts by inducing a martensitic phase transformation through forming and die quenching after heating a metal sheet into a high temperature austenite phase. However, it is not easy to solve various formability problems occurring in the hot stamping process due to the complexity of the process and material behavior during high temperature forming. In this study, fracture-related forming limits and martensite phase ratio were selected as criteria for evaluating hot stamping formability. First, a hot stamping test was performed on a T-type part that simplified the B-pillar, an automotive body part, and the fracture behavior according to the temperature and thickness of the sheet blank was investigated. Additionally, forming analysis was performed on the hot stamping process of mass-produced B-pillar parts by varying the temperature of the sheet blank, the thickness of the sheet blank, the die-blank friction coefficient, and the strain-rate sensitivity of material among various process and material variables. Based on the analysis results, the effect of each process and material variable on the hot stamping formability of B-pillar parts was quantitatively analyzed. By utilizing the results of this study, it will be possible to solve the formability problem that occurs in the mass-production hot stamping process for automotive body parts and improve the quality of parts in the future.

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Section: Effect Of Process and Materials Variables On Hot Stamping Fo...mentioning

confidence: 99%

A Study on the Effect of Process and Material Variables on the Hot Stamping Formability of Automotive Body Parts

You

Kim

2021

Metals

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“…9,17,[20][21][22][23][24][25][26][27][28][29][30][31] The observations from the experimental data ( Figure 2) suggest that the value of n varies with orientation with respect to the rolling direction. Appropriate modelling of n described above, accounting for the anisotropy effect, can be used for realistic predictions of hardening during plastic deformation.…”

Section: Validation Of Expressions and Implicationsmentioning

confidence: 97%

A variable strain hardening model for anisotropic sheet metals

Hariharan

Prakash

2012

The Journal of Strain Analysis for Engineering Design

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A phenomenological approach is proposed to model the influence of texture-induced anisotropy in the variation of strain hardening characteristics of a sheet material. The variation of uniaxial strain hardening exponent with rolling direction is modelled using existing anisotropic yield criteria assuming power law strain hardening behaviour. The model is extended to the biaxial region to predict the effective strain hardening exponent with the assumption of constant plastic work. The prediction of both uniaxial and biaxial strain hardening is compared with the experimental data available in the literature. It is observed that a variable strain hardening exponent provided greater accuracy of numerical prediction than the existing isotropic model. The accuracy of the proposed model is dependent on the yield criteria and the flow rule used for the modelling.

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“…G. Ingarao et al investigated the in uence of thinning and springback of dual-phase steels in U-shape bending operation which was based on multi-objective approach [36]. B. Sarkar et al analysed the in uence of materials parameters on thinning distribution in SMF process and determined that the thinning variation is the function of strain path [37]. B.T.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the effect of different punch shapes on thickness distribution of AA5052 sheet in stretch flanging process

Kumar¹,

Panthi

Ahmed³

et al. 2022

Preprint

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Flanging is a well-known process in sheet metal forming (SMF) process, which is highly used in automobile industry and in manufacturing of home appliances. The effectiveness of the flanging process depends on the geometry of tools, material properties etc. In the present research assessment, influence of punch shape on thickness variation in aluminium alloy sheet in stretch flanging (SF) process is presented, which is major challenge of this process. Six types of punches are used in the present work i.e. spherical, conical, cylindrical, 2 step, 3 step and 6 step. Punch of shape is an important part of tooling that affects the deformation behaviour of blank. FEM simulation work is carried out for the assessment of thickness and strain distribution in the flange portion (along the die profile radius and midsection (centre) of blank) in stretch flanging process. The results are validated with experiments that observed in a very good agreement. The reduction in thickness of blank is found minimum in hemispherical punch along the die profile radius and in the midsection of blank as compared to other punch geometry. Thus, it is concluded from this work, based on the reduction of thickness of blank, that the hemispherical punch profile is more suitable in the product design by stretch flanging process.

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Thinning as a failure criterion during sheet metal forming

Cited by 6 publications

References 3 publications

A Study on the Effect of Process and Material Variables on the Hot Stamping Formability of Automotive Body Parts

A Study on the Effect of Process and Material Variables on the Hot Stamping Formability of Automotive Body Parts

A variable strain hardening model for anisotropic sheet metals

Analysis of the effect of different punch shapes on thickness distribution of AA5052 sheet in stretch flanging process

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